Inherit default profile activation for spring-snapshot-build in the
spring-boot-starter-parent from the spring-boot-parent.
Allow sample projects to work correctly in eclipse.
Rework main build POM to be an aggregator pom that does not inherit
from any parent. Introduce new spring-boot-dependencies module to
act as a parent for both spring-boot-starter-parent and
spring-boot-parent.
Dave Syer
Phillip Webb